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Title: Wideband dichroic-filter design for LED-phosphor beam-combining

Abstract

A general method is disclosed of designing two-component dichroic short-pass filters operable for incidence angle distributions over the 0-30.degree. range, and specific preferred embodiments are listed. The method is based on computer optimization algorithms for an N-layer design, specifically the N-dimensional conjugate-gradient minimization of a merit function based on difference from a target transmission spectrum, as well as subsequent cycles of needle synthesis for increasing N. A key feature of the method is the initial filter design, upon which the algorithm proceeds to iterate successive design candidates with smaller merit functions. This initial design, with high-index material H and low-index L, is (0.75 H, 0.5 L, 0.75 H)^m, denoting m (20-30) repetitions of a three-layer motif, giving rise to a filter with N=2 m+1.

Inventors:
Issue Date:
Research Org.:
Light Prescriptions Innovators, LLC, Altadena, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1176419
Patent Number(s):
7859754
Application Number:
11/982,492
Assignee:
Light Prescriptions Innovators, LLC (Altadena, CA)
Patent Classifications (CPCs):
G - PHYSICS G02 - OPTICS G02B - OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
DOE Contract Number:  
FC26-05NT42341
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 97 MATHEMATICS AND COMPUTING

Citation Formats

Falicoff, Waqidi. Wideband dichroic-filter design for LED-phosphor beam-combining. United States: N. p., 2010. Web.
Falicoff, Waqidi. Wideband dichroic-filter design for LED-phosphor beam-combining. United States.
Falicoff, Waqidi. Tue . "Wideband dichroic-filter design for LED-phosphor beam-combining". United States. https://www.osti.gov/servlets/purl/1176419.
@article{osti_1176419,
title = {Wideband dichroic-filter design for LED-phosphor beam-combining},
author = {Falicoff, Waqidi},
abstractNote = {A general method is disclosed of designing two-component dichroic short-pass filters operable for incidence angle distributions over the 0-30.degree. range, and specific preferred embodiments are listed. The method is based on computer optimization algorithms for an N-layer design, specifically the N-dimensional conjugate-gradient minimization of a merit function based on difference from a target transmission spectrum, as well as subsequent cycles of needle synthesis for increasing N. A key feature of the method is the initial filter design, upon which the algorithm proceeds to iterate successive design candidates with smaller merit functions. This initial design, with high-index material H and low-index L, is (0.75 H, 0.5 L, 0.75 H)^m, denoting m (20-30) repetitions of a three-layer motif, giving rise to a filter with N=2 m+1.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2010},
month = {12}
}

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